My cure for the same issue!
Entirely to many connections to come loose on a dual battery setup. After hitting bumps and my guages going out to having my winch smoke up the whole jeep due to what appeared to be a good connection drove me to this!
Same situation here, my alternator fried itself and took one of my batteries with it. Upgraded to a 320 amp alternator from Quality Power and a Odyssey PC2250 now sits where the 2 batteries once did. And I ran 2/0 wiring to amps and winch to solve power supply and demand issues Also installed 4...